Oh, for a longitudinal butt you could edge glue the pieces with epoxy and
lift them carefully into place together to get a nice tight seam, then
fibreglass the inside. When I butt two pieces of plywood together with PL
Premuim and a plywood butt block, I first put a little epoxy all along the
edge before pushing the pieces together. It saturates the end grain to
keep water out and gives a better seal, at least that's my assumption.

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